Martin Gonzalez Sanchez, 24, of Orem, and April Lynn Torres, 15, of Provo, were ejected and pronounced dead at the scene, police said. Neither was wearing a seat belt, officials said.

On Saturday in Spanish Fork Canyon, Alice May Olsen, 65, was killed after her car and a semi-trailer truck collided head on, the Utah Highway Patrol reported.

The West Jordan woman had been weaving in and out of traffic before she hit a produce truck from Texas, according to the Utah Highway Patrol. Authorities believe fatigue was the cause of the 4 p.m. accident.

In Iron County on Saturday, two adults were killed after their truck rolled about 12:15 a.m.

Police believe the woman in the passenger seat, identified as Esparanza Embrosio-Vicente, had just unbuckled to give a bottle to her infant in the rear seat when the truck crashed. She and the driver, identified as Santos Sanic-Lajpop, were ejected and killed.

The infant and a toddler in the rear seat suffered only minor injuries. Police believe all occupants lived in Beryl, Iron County.

Authorities believe the crash occurred after the tread on one of the truck's tires separated.

Utah Highway Patrol troopers were completing investigations of all four incidents on Sunday.

According to statistics released by the Highway Patrol's "Zero Fatalities" campaign, three people died in vehicle accidents over the Independence Day weekend in Utah in 2006. In all of 2006, 267 people were killed, including close to two dozen children.

By the end of May 2007, 129 people had died in traffic accidents, according to the Zero Fatalities Web site. If the upward trend continues, 2007 fatalities will have increased by more than 20 percent by the end of the year.

Seven-year-old Caleb Howard, injured in Thursday's crash in Layton, remained in intensive care in critical condition on Sunday. His 13-year-old sister, Rachel Howard, also hospitalized at Primary Children's Medical Center in Salt Lake City, had improved but had not been released. She took her first walk Sunday, said family spokeswoman Ashley Stolworthy.

The siblings' 11-year-old sister, Esther, died earlier but remained on life support on Sunday so her organs would be eligible for donation.

Stolworthy said the Huntsville family is staying in Salt Lake City while the two children are hospitalized. They have received comments of love and support from communities in Utah and from Texas, where the family once lived, and they have also reported special experiences surrounding their daughter's organ donations.

To contribute to the family, which was not covered by insurance due to the father's self-employment, visit any Wells Fargo branch. Any money not needed by the family will be donated to blood and organ-donation efforts. For updates on the children's condition or to offer consolation to the family, visit benhowardfamily.blogspot.com.

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E-mail: rpalmer@desnews.com